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B 小学数学 (SDUT 2445) spilt和Integer.parseInt()用法。
import java.io.*;
import java.util.*;
import java.nio.file.*;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int ans = 0,i;
while (sc.hasNext()) {
String s = sc.nextLine();
String[] a = s.split("\\+|\\-|\\=");
if (!a[2].equals("?")) {
int x1 = Integer.parseInt(a[0]);
int x2 = Integer.parseInt(a[1]);
int x3 = Integer.parseInt(a[2]);
for(i = 0; i < s.length(); i ++) if(s.charAt(i) == '+' || s.charAt(i) == '-')break;
if (s.charAt(i) == '+') {
if (x1 + x2 == x3)
ans++;
}
else {
if(x1 - x2 == x3) ans ++;
}
}
}
System.out.println(ans);
}
}
加密术 (SDUT 2787)
import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner (System.in);
String s,t;
while(sc.hasNext()) {
s = sc.next();
t = sc.next();
int num = 0;
int i,j = 0;
int f = 0;
for(i = 0; i < s.length(); i ++) {
for(; j < t.length(); j ++) {
if(s.charAt(i) == t.charAt(j)) {
num ++;
break;
}
if(i != s.length() - 1) {
if(j == t.length()) {
f = 1;
break;
}
}
}
if(f == 1) break;
}
if(num == s.length() && f == 0)
System.out.println("Yes");
else
System.out.println("No");
}
}
}
救基友记2(SDUT 2192) replace用法
import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner (System.in);
String s;
int t;
t = sc.nextInt();
while(t-- > 0) {
s = sc.next();
String s1 = "cRazY";
String s2 = "CraZy";
String news1 = "CrAZy";
String news2 = "cRAzY";
s = s.replace(s1, news1);
s = s.replace(s2, news2);
System.out.println(s);
}
sc.close();
}
}
Eddy的难题(SDUT 2271)indexOf用法
import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner (System.in);
String s,t;
while(sc.hasNext()) {
s = sc.next();
t = sc.next();
s = s + s;
if(s.length() / 2 < t.length()) {
System.out.println("no");
}
else {
if(s.indexOf(t) != -1) {
System.out.println("yes");
}
else System.out.println("no");
}
}
}
}